Downloaded pidgin icon packs can be uploaded (one at a time) to Slack by posting the form. Note that this does not (yet) handle name conflicts with existing emotes. Failures to upload will be printed to the console.
install the requirements
pip install -r requirements.txt
Extract your icon pack into the working directory, under a new folder called "emote_files" Set the following environment variables:
SLACK_TEAM
SLACK_COOKIE
Then execute:
python pidgin_emotes_to_slack.py
This doesn't work anymore as Slack updated the emoji upload page.
Use https://chromewebstore.google.com/detail/neutral-face-emoji-tools/anchoacphlfbdomdlomnbbfhcmcdmjej instead